{"id":4615,"date":"2026-08-12T14:48:33","date_gmt":"2026-08-12T12:48:33","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&p=4615"},"modified":"2026-08-12T14:53:32","modified_gmt":"2026-08-12T12:53:32","slug":"essais-acceleres","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/it\/guide-dutilisateur\/essais-acceleres\/","title":{"rendered":"Prove accelerate"},"content":{"rendered":"

Attendre trois ans pour valider une dur\u00e9e de vie de trois ans est rarement acceptable. <\/p>\n\n\n\n

Les essais acc\u00e9l\u00e9r\u00e9s soumettent le produit \u00e0 une contrainte major\u00e9e<\/strong> : temp\u00e9rature, tension, charge, humidit\u00e9… puis extrapolent vers les conditions normales.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Les mod\u00e8les d’acc\u00e9l\u00e9ration<\/strong> disponibles :<\/h2>\n\n\n\n
Mod\u00e8le<\/strong><\/td>Contrainte typique<\/strong><\/td><\/tr><\/thead>
Arrhenius<\/strong><\/td>Temp\u00e9rature : le mod\u00e8le des d\u00e9gradations chimiques<\/td><\/tr>
Eyring<\/strong><\/td>Temp\u00e9rature, avec un second facteur<\/td><\/tr>
Loi de puissance inverse<\/strong><\/td>Tension, charge m\u00e9canique, pression<\/td><\/tr>
Peck<\/strong><\/td>Temp\u00e9rature et humidit\u00e9 combin\u00e9es<\/td><\/tr>
Coffin-Manson<\/strong><\/td>Cyclage thermique, fatigue<\/td><\/tr>
Basquin<\/strong><\/td>Fatigue m\u00e9canique sous amplitude de contrainte<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

On renseigne le type de mod\u00e8le<\/strong>, la ou les variables de contrainte<\/strong>. Un bouton permet d’ajouter une 2\u00e8me contrainte<\/strong>, la colonne des valeurs de d\u00e9faillance<\/strong> e i censures<\/strong>. Arrhenius demande une \u00e9nergie d’activation<\/strong>.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Les r\u00e9sultats donnent l’\u00e9quation<\/strong> du mod\u00e8le ajust\u00e9, son R2<\/strong>, le graphique Dur\u00e9e de vie vs Stress (log-log)<\/strong> e il facteur d’acc\u00e9l\u00e9ration<\/strong>.<\/p>\n\n\n\n

\n

\ud83d\udca1 Le graphique log-log est le contr\u00f4le de validit\u00e9 : les niveaux de contrainte doivent s’aligner. Un point qui d\u00e9croche signale que ce niveau a chang\u00e9 le m\u00e9canisme de d\u00e9faillance<\/strong> au-del\u00e0 d’une certaine temp\u00e9rature, ce n’est plus la m\u00eame d\u00e9gradation. Ce niveau doit \u00eatre \u00e9cart\u00e9 de l’extrapolation.<\/p>\n<\/blockquote>\n\n\n\n

\n

\u26a0\ufe0f C’est le risque majeur de la m\u00e9thode : acc\u00e9l\u00e9rer trop fort d\u00e9clenche un autre mode de d\u00e9faillance<\/strong>, et l’on extrapole alors une loi qui ne d\u00e9crit pas la vie r\u00e9elle du produit. Rester dans un domaine o\u00f9 le m\u00e9canisme est le m\u00eame, et se m\u00e9fier des facteurs d’acc\u00e9l\u00e9ration tr\u00e8s \u00e9lev\u00e9s.<\/p>\n<\/blockquote>\n\n\n\n

\n

\ud83d\udca1 Pr\u00e9voir au moins trois niveaux de contrainte<\/strong>. Avec deux, on trace une droite par deux points : rien ne permet de v\u00e9rifier qu’elle est droite.<\/p>\n<\/blockquote>","protected":false},"featured_media":0,"menu_order":80,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[36],"class_list":["post-4615","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-9-fiabilite"],"acf":[],"yoast_head":"\nEssais acc\u00e9l\u00e9r\u00e9s - Ellistat<\/title>\n<meta name=\"description\" content=\"Arrhenius, Eyring, Peck, Coffin-Manson : choisissez le bon mod\u00e8le d'essai acc\u00e9l\u00e9r\u00e9 pour extrapoler la dur\u00e9e de vie de vos produits sans attendre des ann\u00e9es.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ellistat.com\/it\/guida-per-lutente\/essais-acceleres\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Essais acc\u00e9l\u00e9r\u00e9s - 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